Add %FOREIGN-LAMBDA.

1 files changed, 117 insertions, 0 deletions

diff --git a/MLKForeignProcedure.m b/MLKForeignProcedure.m
new file mode 100644
index 0000000..fa889cb
--- /dev/null
+++ b/MLKForeignProcedure.m
@@ -0,0 +1,117 @@
+/* -*- mode: objc; coding: utf-8 -*- */
+/* Toilet Lisp, a Common Lisp subset for the Étoilé runtime.
+ * Copyright (C) 2008  Matthias Andreas Benkard.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#import "MLKForeignProcedure.h"
+#import "globals.h"
+#import "util.h"
+
+#import <Foundation/NSArray.h>
+#import <Foundation/NSEnumerator.h>
+
+#ifdef HAVE_FFI_H
+#include <ffi.h>
+#elif HAVE_FFI_FFI_H
+#include <ffi/ffi.h>
+#endif
+
+#include <stdlib.h>
+
+
+@implementation MLKForeignProcedure
+-(id) initWithCode:(void *)code
+     argumentTypes:(NSArray *)argTypes
+        returnType:(id)returnType
+{
+  int i;
+  NSEnumerator *e;
+  id el;
+
+  self = [super init];
+
+  _code = code;
+  _returnType = MLKForeignTypeWithTypeDesignator (returnType);
+
+  _argumentTypes = malloc (sizeof (MLKForeignType) * [argTypes count]);
+
+  e = [argTypes objectEnumerator];
+  i = 0;
+  while ((el = [e nextObject]))
+    {
+      _argumentTypes[i++] = MLKForeignTypeWithTypeDesignator (denullify (el));
+    }
+
+  return self;
+}
+
+-(NSArray *) applyToArray:(NSArray *)arguments
+{
+  int argc = [arguments count];
+  ffi_cif cif;
+  ffi_type *arg_types[argc];
+  ffi_type *return_type;
+  ffi_status status;
+  void *argv[argc];
+  id return_value;
+  int i;
+
+  for (i = 0; i < argc; i++)
+    {
+      arg_types[i] =
+        MLKFFITypeWithForeignType (_argumentTypes[i]);
+      argv[i] = alloca (arg_types[i]->size);
+      MLKSetForeignValueWithLispValue (argv[i],
+                                       [arguments objectAtIndex:i],
+                                       _argumentTypes[i]);
+    }
+
+  return_type = MLKFFITypeWithForeignType (_returnType);
+
+  status = ffi_prep_cif (&cif, FFI_DEFAULT_ABI, argc, return_type, arg_types);
+  if (status != FFI_OK)
+    {
+      [NSException raise:@"MLKInvalidFFITypeException"
+                   format:@"FFI type is invalid (this is probably a bug)."];
+    }
+
+  ffi_call (&cif, FFI_FN (_code), &return_value, (void**)argv);
+
+  // FIXME
+  if (return_type == &ffi_type_void)
+    return [NSArray array];
+  else
+    return [NSArray arrayWithObject:nullify (MLKLispValueWithForeignValue (&return_value, _returnType))];
+}
+
+-(NSString *) description
+{
+  return MLKPrintToString(self);
+}
+
+-(NSString *) descriptionForLisp
+{
+  return [NSString stringWithFormat:@"<Compiled procedure @%p>", self];
+}
+
+-(void) dealloc
+{
+  // FIXME:  Can we really just use free() here?
+  free (_code);
+  free (_argumentTypes);
+  [super dealloc];
+}
+@end